Code Improvement

Change code in wsgi.py.

Before:
if not is_dict(body[entity_name]):
    return False
return True

After:
return is_dict(body[entity_name])

Since this calling is in the end of the method I
can just return the result of the calling.

Change-Id: I834f26aa5a91abd18b8da10aef81f3aeb72a61ed
Merge "Code Improvement"